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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9310518569b2dd9b695f076fd94a6cb0168280c8f7be5e04604161be85178e' 
  AND token = 'rbi5j80DP1sXX8eGNBMEtrJxkNzWjIbV6Ni9rDL/qNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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