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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c1972a501829a1c43a7300e047a624d925e34294f6b6f0485bc48a3ab460f9' 
  AND token = 'UCeXfPipj4o2XIyHcllBge4fzvYpAvDMB6M9l0AEE4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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