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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7657fa0aa086458f6892e1c0ae9f692275aa4b065f7a8ddfd7a3577b4c9605cf' 
  AND token = '5IskVAf7Dqp/mCCiOJ+M0r7jSWjIVJL67MWSM7NljD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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