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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f1ce19f568bc81f4dbd542a6fd0964f0a8fc1f40d0446a65067ee45b552760' 
  AND token = '8WIdouxIJJkScb0lwM0TxRwotLQJUzZcNCoYIj32a0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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