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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c76218d333e1737de292b6404a7770897b48634fe625d48799cb80b51060a7' 
  AND token = '6PvixUr7VAt6ghweOSZmXm4P6eqqR0y2d5xqb+YOhfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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