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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5b2046a497ba81d10acdd21e02954fa8d51c4c53365161c9654a7db50deff4' 
  AND token = 'tR2VFZ5yv9eAOmKaztGs9+gxPnr1OI+fMtbWfNfILYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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