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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb52624eff8f22dbb241d9c15d9175eb7a9f24a4d9d5ca77a6ff12e80c6bf0af' 
  AND token = 'GMB2edI4NQMOmm0YZos0D7bdpayEcka7hjfljl2DtG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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