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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79676081e9c2e173410a2c54888826b8e358b38df9cd2ecb92a627a5409bebf' 
  AND token = 'hDm5RIfifGInjMz3xsxfmzBcZinXFVOmUC9DqFnryt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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