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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92f194d784ac8911cb1fa873b3734bc4f45355f1d6d3dec441b1e8b313438e3' 
  AND token = 'Rn309oT0Hln1o4z/HocUP+WqB5NZZ10/biK+xMwxLxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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