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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac08859591d53728b3811b3e3f4824110db8ed92bb94d255d4854d6cf446e436' 
  AND token = 'C3qBpubjp1o3yfmJfE6ZM6hoQmffb0dskDFsHKdL4uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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