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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1ba6a5b69d681947305c73a8a3e1708d30b664f9231bb49908ae84c7945683' 
  AND token = '6f8Oc7gnQ192wnSYayEOF7+9g+SCscezGVnGTuLQ0+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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