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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce74b74210c69588b45a72fdca544b0e99c0dcf3d8dd51cd996525938d7940a4' 
  AND token = 'Il3KR1UrvnCVsvoqInFbAtdB8gQxkhIRhXP3fxNX7Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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