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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c5f434a8717e5f78ae41d6c8b650a47b9d0dfa26c19eb210ac768d81c49b2' 
  AND token = 'm6h5LzTCwAJHB3GnjB5+twEOSI+1kuB5wcb05IOeeqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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