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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19964063345a1c589e93c7fee1e76fb7b29b75ba3a2559a837e247e0c58c877b' 
  AND token = 'dnjdzxLwxQ3mVoJQluN+qNMdbP0FC62Eoju7qa5u0QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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