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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfa6654892b44cbe0a838cbd5215f6e5ed4c520bdcf47c795f832c6cfd858cf' 
  AND token = 'hM39ppH8t6Rlfz//5ye9G87U/MaZ0PnYEF2HBwFSX+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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