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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4645c13cd8454ee0a7f999f3338de11ace95a005809355b7649b024f24acef45' 
  AND token = 'W26vN1d7Jt2Z9xtKLOVC5HazoMbhOyunWk80QqM7ZZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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