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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8b49d4068947b2e7c8ca8ea67940303ed6e4b091412f0e930948bc1da43226' 
  AND token = '41Jj6FgANrNqQwEUCOQyhd0SoeqSQASIB1s+4KD+2ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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