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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d98838ce0698cdedf45a694b424d8e7ce22e5cb9ee95a14b3dc9804d3b1d685' 
  AND token = '4jlmvfCkqfXqihUhViRWvX8zo1Q2qN3MarYEpKlAqoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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