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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f8f15890a8ebf9fbeb0681176a6d11bafc66e8614882b26474b49f35abc902' 
  AND token = '30f42A2m/8/RZJWLlGaOEnLhKqJpRiMT77HNh0Naz+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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