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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140076ff3a84fc9b9268e677033248717c66ecbc74ff1c9ac3307a2cc24f0ac5' 
  AND token = 'JBNCgrtCkBv8LknbrWS+eEfS+Q0lFwQlOr9mV1xT3Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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