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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6a9213c6284acb7ce9f207b561f0dc1e28ffdf71f054b5cf8442a27ccf827e' 
  AND token = 'pBjH5EEl8O6Cy2tFAj/qN+GBlb/e7e/xOBzEjS9PpJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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