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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86e3ad1c7ad242493f093f85d081f40a602b0484081de537151384d5ad8ef9c' 
  AND token = '2fz2Vt1dyYz6VHVLgQ1FSRHW7RKkCnheAz7bBQKZk40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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