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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b778d7b101d377a0932bad7bffb035a459981e282e4cf84d93d1c64d0009eba' 
  AND token = 'NKlH2OhGQ1YyITdzf6CisC7LamglecOQEh6dD4Ha7hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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