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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f75b2949d5b0880700d3fb6857b7ca472283310f17a579c0fa619276767e297' 
  AND token = 't8s8XSWvVfNbj7zxj75x6UdKPMMcmvLuDvtu9dwq5Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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