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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4043811f1ce212e8393480d3c7c19ffea5dee3b02db3b5a47717ebde6b8d8faa' 
  AND token = 'vMfTFmoLudnpf9dY24ks7i3D3bVXWjkRY4gW+X5j888=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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