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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00605a135fe828e0041ee2a7c189834e49bbe43ccc3e3e2831219140b7529a3a' 
  AND token = 'ZZBT8xDz/hE7rJ42S4OXBu4/dgyd5W2Xun8L7hvyD8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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