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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce36cc3d0aefdd5a692a9bacba0af75a5db31ce5bc1c2c8749bb9e49acc9807' 
  AND token = '21WghmY6gtWnPpaspb2F6MHH07r05CY0DB/bPPBVqZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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