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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98ec60675f94a86c5d7a2e1350c57ab63a5e97bb88fa47b4632cae701eb9e6e' 
  AND token = 'JJ/1/pAbpLNS4ZhN6cZW4mYu1/oRfPZv9BtJtxJJXhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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