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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae0c2c040a633a9997169dc7585038aa0099f990b1d6add0425c83aa6cd5c51' 
  AND token = 'u9G5EVJKanXPjxFCqMtVaBHxyl6PUyQ9rRXFMX35JwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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