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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d995d27953ddd9376dc78c1d0eb7900b6aae82d7f1f6638c264d4133e6e89b5' 
  AND token = 'X4lpX0CS1xd/98EAafNk3Z91StmJr1ZjPAU2R10MKLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}