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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ff454e9390a34db9585d4b65d7bf45f7c3b060ad6ec6856bf09f2e25e6266b' 
  AND token = 'cxh5erIVcZOiEwnMsfv7bI/4ZCTdmoSuEBF/JVGltRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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