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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee28eb29d1b28f66c62117fa0977b3063e58b83a1a42abce62d5a6ab8f96f81' 
  AND token = 'kFlsnrmFm2XisIm+bXDMa+vAMZeKelsizA64B8TjIOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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