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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97009fafeca7601a98108ee7442b6af1af6e88b93ea227689fd9a25d81e8313e' 
  AND token = 'wL/3JZ4OH9R0nPI88pseGaW++jPKkKUJJ8uop7vI3hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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