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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fc355cbf30fd9b0b482f0ae50e46b15e866dbf98c3832b6aec5d4ef1ea91d8' 
  AND token = 'iUUw6KUPPIePTYP/9x3joosuZwDTzEDEOD4ednRBmpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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