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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71138285dc88f4f57d58e167f901c9ce7c6cc5f3bb8d121feb9af1e33fed7974' 
  AND token = 'Px34mna/zEi7K5l9AAs8k/emi7vJtrp39mu0fu9JJ18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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