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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0e4f8d013ef8e79f23e2993719df3da0d490d3ea7b4828f786755659035196' 
  AND token = 'sNLu6unOF4IXca2XQF64SF06vKSy8Nk+CfdkW2r7Wcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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