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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82b2abc71e548db1d088d60ad9ac14e9b3c3e4eabb0b798d28534b5d3ec56bc' 
  AND token = '2QsuWB00H+f8knWtY5k9+Q+Ir3m7WoJzsTW0gstR74E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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