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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7adc393ec1e85215c70fa10c1a7b03a5bbb12768bf5c69543379d7cf3d903d5' 
  AND token = '4bGRau7BfKtqm6ETmXFWbLpqbMYHjTWwFK/xOGtqAA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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