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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e951d2486d52af6094e3265a7cb80ceae6afd0dc44971d7cb361939108e66488' 
  AND token = '0s6d6hfkLyM9y7Brs6dKr0UDVnxP9V+XOTHnhqXivqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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