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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569651142edc995b1baa4e6ec4068df55d8fe6f35fe4a363f8218fbfd3f0dae5' 
  AND token = 'SL3ae44IkaoNTg8W8+1XTVcBIVLwb+3+kV2iXD+MuUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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