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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f001d3a68cfe7ed7e7d1c178214226c01307808c423cf6c14de9c89d9a1cb3' 
  AND token = 'nWsJeaHKZK7R8Du/VTkHq+0wXkKkirOEvwGvrxH/Q1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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