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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c7bfc9f3213627b9c42b0e6fad9d9235ed49964436aa317d42a87f9ea97fda' 
  AND token = '0nVGP7BKQWqiWFJ2foPLBXqPtWTnqBd0jPeFs+hFcgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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