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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8a4e895b2263d18500860964732ac64dd5d4f53cabd4cef10e71186c119730' 
  AND token = 'gj7p/NB35fxlacdAuasptuMldqTzN9sMv4RgWa4l7Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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