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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766c1454e0a1088fc5200e1618604ffe1b34d84ef8811fddfe5199973fadfd72' 
  AND token = 'qW6E9j0fLk2MVGQb1J2kxNpTUJJVbZgpYD+Kasu6Cw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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