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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae8c8bab17f350e9866265d5e4350cadcec51c82485b0a9c7ee28ef3065084e' 
  AND token = 'LDzkrGgWwBbsJ2DG2FLRL4uy+byd7fIt6UqaORexoVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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