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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc55eb90800d097b66b768f23597638c89dc40d5370e599723b05930c355930f' 
  AND token = '1uJC8f5o5C6fG5E4KA7Dm9E1kYl7yRM8GmHnC6Fr1+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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