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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e3ca68e2a42fe195fa4179427fb750b75d43f408717673cc023ed9a33f955d' 
  AND token = '4cWfWP8I88SaDZet+9I11P8Wp+4NI5JdebpFf5OC7N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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