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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d46ff9176d0f9a001981f5ba39c5eefd145cd630b677ceafbe1c30efcff77c' 
  AND token = 'Iiu2yFHQcmBQHxZ/O2fM1+1tN80SW2/j0yr/RXLW3XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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