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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7d20d064af302e82478c20a25b7a2948095714eb68e135ced112d3b4af7711' 
  AND token = 'AR1v7eqLlJU4ReM1ZOkC2joziQOIR/1A2f2HmRqPEU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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