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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509271f9aacd9d316f71e426a7d5650b0709251c77294121ecde0f0f70adbfd4' 
  AND token = 'ud++RLOohD4rf265WrZKYjYz9hkGg2b4mEXqngU9VzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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