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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1b615b5b241d02821e3fa96b159a2835ae23c1ee967cfddb96455533baac8f' 
  AND token = 'l+Y2wkzP/BWmnOkW1xMrlurk3d4Q7ipxIsCPF8CRFDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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