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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9dc5f74069b2176f64a29c5e8e5bc30b4655edeb2230079e9ad1ed4517fc63' 
  AND token = 'fyWQiIUErWKELXFa+9IkspJyhXY+i3eW3c099NLG0ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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