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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f565812ec7f5cc3e73e5f82eb6e9c4b85f43ca3041120a7f55c90e35faded1' 
  AND token = 'tVkSVfxlySRdki4ml5Nrl5pIKI3hdUZVH58zHprQtk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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